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| <title>The MPL Reference Manual: push_front</title> |
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| <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./intrinsic-metafunctions.html" class="navigation-link">Intrinsic Metafunctions</a> / <a href="./push-front.html" class="navigation-link">push_front</a></td> |
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| <div class="section" id="push-front"> |
| <h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1444">push_front</a></h1> |
| <div class="section" id="id345"> |
| <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> |
| <pre class="literal-block"> |
| template< |
| typename Sequence |
| , typename T |
| > |
| struct <a href="./push-front.html" class="identifier">push_front</a> |
| { |
| typedef <em>unspecified</em> type; |
| }; |
| </pre> |
| </div> |
| <div class="section" id="id346"> |
| <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> |
| <p><tt class="literal"><span class="pre"><a href="./push-front.html" class="identifier">push_front</a></span></tt> performs an insertion at the beginning of the sequence with guaranteed <em>O(1)</em> |
| complexity.</p> |
| </div> |
| <div class="section" id="id347"> |
| <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> |
| <pre class="literal-block"> |
| #include <<a href="../../../../boost/mpl/push_front.hpp" class="header">boost/mpl/push_front.hpp</a>> |
| </pre> |
| </div> |
| <div class="section" id="id348"> |
| <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> |
| <p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p> |
| </div> |
| <div class="section" id="id349"> |
| <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> |
| <table border="1" class="docutils table"> |
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| <col width="16%" /> |
| <col width="33%" /> |
| <col width="51%" /> |
| </colgroup> |
| <thead valign="bottom"> |
| <tr><th class="head">Parameter</th> |
| <th class="head">Requirement</th> |
| <th class="head">Description</th> |
| </tr> |
| </thead> |
| <tbody valign="top"> |
| <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td> |
| <td><a class="reference internal" href="./front-extensible-sequence.html">Front Extensible Sequence</a></td> |
| <td>A sequence to insert into.</td> |
| </tr> |
| <tr><td><tt class="literal"><span class="pre">T</span></tt></td> |
| <td>Any type</td> |
| <td>The element to be inserted.</td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id350"> |
| <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> |
| <p>For any <a class="reference internal" href="./front-extensible-sequence.html">Front Extensible Sequence</a> <tt class="literal"><span class="pre">s</span></tt> and arbitrary type <tt class="literal"><span class="pre">x</span></tt>:</p> |
| <pre class="literal-block"> |
| typedef <a href="./push-front.html" class="identifier">push_front</a><s,x>::type r; |
| </pre> |
| <table class="docutils field-list" frame="void" rules="none"> |
| <col class="field-name" /> |
| <col class="field-body" /> |
| <tbody valign="top"> |
| <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./front-extensible-sequence.html">Front Extensible Sequence</a>.</p> |
| </td> |
| </tr> |
| <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> |
| <pre class="literal-block"> |
| typedef <a href="./insert.html" class="identifier">insert</a>< s,<a href="./begin.html" class="identifier">begin</a><s>::type,x >::type r; |
| </pre> |
| </td> |
| </tr> |
| <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first last"><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><r>::value</span> <span class="pre">==</span> <span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span> <span class="pre">+</span> <span class="pre">1</span></tt>; |
| <tt class="literal"><span class="pre"><a href="./front.html" class="identifier">front</a><r>::type</span></tt> is identical to <tt class="literal"><span class="pre">x</span></tt>.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="id351"> |
| <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> |
| <p>Amortized constant time.</p> |
| </div> |
| <div class="section" id="id352"> |
| <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> |
| <pre class="literal-block"> |
| typedef <a href="./vector-c.html" class="identifier">vector_c</a><int,1,2,3,5,8,13,21> v; |
| <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><v>::value, ==, 7 ); |
| |
| typedef <a href="./push-front.html" class="identifier">push_front</a>< v,<a href="./integral-c.html" class="identifier">integral_c</a><int,1> >::type fibonacci; |
| <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a><fibonacci>::value, ==, 8 ); |
| |
| <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>< |
| fibonacci |
| , <a href="./vector-c.html" class="identifier">vector_c</a><int,1,1,2,3,5,8,13,21> |
| , <a href="./equal-to.html" class="identifier">equal_to</a><_,_> |
| > )); |
| </pre> |
| </div> |
| <div class="section" id="id353"> |
| <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> |
| <p><a class="reference internal" href="./front-extensible-sequence.html">Front Extensible Sequence</a>, <a class="reference internal" href="./insert.html">insert</a>, <a class="reference internal" href="./pop-front.html">pop_front</a>, <a class="reference internal" href="./front.html">front</a>, <a class="reference internal" href="./push-back.html">push_back</a></p> |
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